Don't forget, the lower the action and the less relief the neck has, the more possibility there is for fret noise.

If the neck is adjusted as well as you can get it, just raise the action until you can't hear the fret buzz through the amp. If you have to get the action ridiculously high to eliminate the fret buzz (which you should begin referring to as "bottoming out") then you need to re-adjust the neck and start over.

You will probably have to adjust many times over to get it just the way you want it.

when adjusting truss rod... press down which frets? Measure at which fret?

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This would be the "How to adjust the truss rod" question. For the answer, see Item 7 and 8 on the guide you posted the link to above. Follow the instructions start to finish.

Elliot Smith said:

What is the action for each string?

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Since you seem to want a mathematical answer, I'll try to put it in mathematical terms:

Fret buzz + raise action until no fret buzz = Correct Action

There's not an exact number for your bass if it's still buzzing when you are done. Either you did something wrong or there is an imperfection somewhere in the bass or there is something about your playing style or personal preference that comes into play.

If you followed the instructions, and you understand the concepts, and you are comfortable that it is set up properly, then you don't need to adjust the truss rod again. If that's the case, you just need to raise the action until it suits you. That's as simple an answer as I know to your questions. If I'm that isn't satisfactory to you, then I suppose I don't understand the question.